LOCATION CHISSOVUN AK
Established Series
JDP/SAS/TJR
02/2022
CHISSOVUN SERIES
Landscape--alluvial plains
Landform--stream terraces
Slope--0 to 3 percent
Parent material--organic material over alluvium
Mean annual precipitation--about 255 mm
Mean annual air temperature--about -6 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--gelic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, nonacid, subgelic Typic Histoturbels
TYPICAL PEDON: Chissovun mucky peat on a woodland terrace with a slope of 2 percent and an elevation of 130 m (The soil was moist throughout when described on September 13, 2015.)
Oe--0 to 11 cm; mucky peat; dark reddish brown (5YR 2.5/2) moist; many very fine roots, and common fine to very coarse roots; very strongly acid (pH 5.0); clear smooth boundary
Oa--11 to 22 cm; muck; black (5YR 2.5/1) moist; common very fine to very coarse roots; strongly acid (pH 5.5); clear irregular boundary
Cg--22 to 38 cm; silt loam; 50 percent gray (2.5Y 6/1) dry, dark gray (2.5Y 4/1) moist, and 50 percent light gray (2.5Y 7/1) dry, gray (2.5Y 5/1) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; few fine and medium pores; 30 percent strong brown (7.5YR 4/6) moist, masses of oxidized iron in matrix; noneffervescent; neutral (pH 7.2); clear wavy boundary
Cg/Oajj--38 to 67 cm; silt loam; 90 percent light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist, and 10 percent dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; massive; moderately hard, firm, slightly sticky and nonplastic; common fine roots; few fine and medium pores; 10 percent strong brown (7.5YR 4/6) moist, masses of oxidized iron in matrix; slightly effervescent; slightly alkaline (pH 7.5); abrupt wavy boundary
Cgf/Oajjf--67 to 100 cm; silt loam; 90 percent light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist, and 10 percent dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; massive; hard, very firm, slightly sticky and nonplastic; 7 percent strong brown (7.5YR 4/6) moist, masses of oxidized iron in matrix; slightly effervescent; slightly alkaline (pH 7.6)
TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska; latitude 66.2911480 degrees, longitude -146.9064470 degrees, datum WGS84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- -4 to 1 degrees C
Depth to permafrost--45 to 75 cm
Other features--cryoturbation in the substratum
Oa horizons
Thickness--10 to 20 cm
Reaction--3.5 to 7.0
Oe horizons
Thickness--10 to 20 cm
Reaction--3.5 to 7.0
A horizon (where present)
Hue--10YR, 2.5Y
Value--2 or 3 moist, 4 or 5 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam, silt
Clay content--0 to 18 percent
Reaction--6.0 to 8.0
Thickness--5 to 20 cm
Cg and Cg/Oajj horizons
Hue--10YR, 2.5Y
Value--2 to 5 moist, 4 to 7 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6.5 to 8.0
Effervescence--none to slight
Combined thickness--20 to 60 cm
Cgf horizon (where present)
Hue--10YR, 2.5Y
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6.5 to 8.0
Effervescence--none to slight
Thickness--75 to 105 cm
Cgf and Cgf/Oajjf horizons
Hue--10YR, 2.5Y
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6.5 to 8.0
Effervescence--none to slight
Thickness--75 to 105 cm
COMPETING SERIES:
Gushdoiman--frequent ponding, tussock tundra vegetation
Goldstream--strongly to very strongly acid mineral horizons
Saulich--pedogenic B horizons; moderately acid to neutral mineral horizons
Strelna--no aquic conditions
Turbellina--strongly acid to extremely acid mineral horizons
Windy Creek--pedogenic B horizons; moderately acid to neutral mineral horizons
GEOGRAPHIC SETTING:
Elevation--100 to 300 m
Climate--short, warm summers and long, very cold winters
Mean annual precipitation--210 to 310 mm
Mean annual air temperature-- -12 to 0 degrees C
Frost-free period--45 to 97 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Tlozhavun--no aquic conditions within 150 cm; drier positions on similar landforms
Tajittro--aquic conditions within 100 cm; drier positions on similar landforms
Yanert--aquic conditions within 25 cm; adjacent swales on terraces
Gushdoiman--aquic conditions within 25 cm; wetter positions on similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturation in normal years--water table top depth between a depth of 25 to 50 cm in June, and between a depth of 50 to 75 cm in July and August
Flooding--none
Ponding--occasional, long
Saturated hydraulic conductivity (Ksat)--moderately high or high throughout
USE AND VEGETATION:
Use--wildlife habitat, subsistence
Potential natural vegetation--white spruce, black spruce, resin birch, lingonberry, grayleaf willow, red fruit bearberry, prickly rose, black crowberry, bog blueberry, bog Labrador tea, littletree willow, shrubby cinquefoil, shrub birch, sedge, bluejoint, dwarf scouringrush, felt lichen, greygreen reindeer lichen, cup lichen, stairstep moss
DISTRIBUTION AND EXTENT: Yukon Flats Lowlands, Alaska; MLRA 232; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Yukon Flats National Wildlife Refuge, Yukon-Koyukuk Census Area, Alaska; 2020
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 47 to 122 cm
*Histic epipedon--Oe and Oa horizons
*Aquic conditions--Cg and Cg/Oajj horizons
*Reduced matrix--Cg, Cg/Oajj, and Cgf/Oajjf horizons
*Redoximorphic iron concentrations--Cg, Cg/Oajj, and Cgf/Oajjf horizons
*Permafrost--Cgf/Oajjf horizon
*Cryoturbation--Cg/Oajj, and Cgf/Oajjf horizons
National Cooperative Soil Survey
U.S.A.